Lets talk brakes

[pilihp2]

Specifically, 17z and 18z calipers.
What rotors would one typically use when going to a 17z or 18z setup? From what I remember, they bolt straight up to a UFO housing, with it bolting straight up what rotor would be required for that? Any clue?

17z's came on certain year Touregs and some cayenne's I believe, what about 18z's?

I'm seeing stuff about bolting to allroads and b5s4's which use HP2's from the factory, which bolt straight up to a UFO housing. The stuff I'm seeing looks like Merecedes discs, but I'm not certain.

[Zaworek]

when i did my coupe i did the research and you could use the 323x32 rotor from a8 with the 17z caliper. since the calipers were expensive of the time of the build went with boxter s calipers

[A1QSHIP]

Here is what I have done for my UrS6 using 18z's calipers, 17z brake pads, UFO hub carriers & A6 4.2 rotors.
http://www.motorgeek.com/viewtopic.php? ... hilit=+ufo
If I were to do this again I would consider using the front rotor from an R32. Same offset as A6 rotor, 245mm, 5X112 bolt pattern. You would have more clearance for the caliper to rotor & rotor ventilation coming from the rear of the disc. There would still be a problem with the top of the pad overhanging the rotor.

Currently have a full Boxster S setup on my Coupe with 323mm rotors on the front & 300mm rotors on the rear. I am considering switching to a 17z caliper, with a two piece rotor for the front.
Can anyone help me with migrating my MG thread to this site?
TIA, Chris

[pilihp2]

Here is what I have done for my UrS6 using 18z's calipers, 17z brake pads, UFO hub carriers & A6 4.2 rotors.
http://www.motorgeek.com/viewtopic.php? ... hilit=+ufo
If I were to do this again I would consider using the front rotor from an R32. Same offset as A6 rotor, 245mm, 5X112 bolt pattern. You would have more clearance for the caliper to rotor & rotor ventilation coming from the rear of the disc. There would still be a problem with the top of the pad overhanging the rotor.

Currently have a full Boxster S setup on my Coupe with 323mm rotors on the front & 300mm rotors on the rear. I am considering switching to a 17z caliper, with a two piece rotor for the front.
Can anyone help me with migrating my MG thread to this site?
TIA, Chris

Can you fit 17" wheels over your setup? From what I've read, it doesnt appear that an 18z setup with rotors in the 350mm range will fit a 17"

PM Marc for help in thread migration

Edit: scratch that. "They would not fit under a set of 17” B5A4 wheels without spacers."

[A1QSHIP]

Mocked it up with a 15mm spacer with the parts mentioned. I could barely get a B6A4 17" wheel to clear the caliper. Different wheels could give different results. From what I have read the 17z caliper is a better choice anyway in terms of brake feel as the pistons sizes between the 17z & 18z calipers are different. If I ever come across an inexpensive set of 17z calipers I will see what can be done.

[Berserker]

Rebuilt 17z calipers are available for $150 each (after core charge) lots of places. Rockauto is one, search for 2005 Porsche Cayenne 3.2 calipers. You'll need to source your own crossover tubes and brake bleeder screw caps, but that's how I got mine for my S6.

[pilihp2]

Rebuilt 17z calipers are available for $150 each (after core charge) lots of places. Rockauto is one, search for 2005 Porsche Cayenne 3.2 calipers. You'll need to source your own crossover tubes and brake bleeder screw caps, but that's how I got mine for my S6.

Exactly why I've been looking at this upgrade more and more seriously lately.
$300 for both calipers is nice. Like, really nice.

[ringbearer]

I hear the 17z with the 18z pad is the way to go. Depending on brackets and rotors of course.

[alxdgr8]

http://www.audizine.com/forum/archive/i ... 60051.html

330mm 4 piston calipers (1LE) can be sourced from:
'07+ Touareg

330mm 6 piston calipers (17Z) can be sourced from:
04-06 Touareg
04-2012 Cayenne V6

350mm 6 piston calipers (18Z) can be sourced from:
04-2012 Cayenne S, Cayenne Turbo
Touareg V10

And for super baller status: (http://www.audizine.com/forum/showthrea ... o-Calipers)
368mm with oddball caliper on '08 Cayenne Turbo/S with option package
380mm with 19z caliper on '09+ Cayenne Turbo/S with option package

18z, 19z, oddball 368 '08 caliper

[PRY4SNO]

I seem to remember from my research that the BoxsterS calipers and 17z are the closest dimensional match to the total piston area of the original G60 calipers, and have the best stopping power/feel/bias.

[pilihp2]

So is there any consensus on what discs you can use when bolting 17z's straight up instead of 18z's? I think they're merecedes discs but damn it's been a long day and I cant remember anything

[PRY4SNO]

I thought it was the massaged Merc discs or D2A8 323 discs with about 1mm off the inside radius to prevent the TRE from rubbing.

I went the latter route on my Cq, but YMMV on a large chassis.

[varia]

I seem to remember from my research that the BoxsterS calipers and 17z are the closest dimensional match to the total piston area of the original G60 calipers, and have the best stopping power/feel/bias.

i remember you mention in my topic as well this "bias" thing.
and i was worried about my setup after reading your comment. but i never experienced anything like that.
i like my brake setup, they work very well in my car. others told me get an adjustable proportion valve and call it a day.

[PRY4SNO]

My rears with the b5s4 calipers/rotors would lock up on dry pavement first, but not really cause much of an issue. New rubber, Dunlop Direzza Star Specs.

But on ice, new Nokians, and the car would flip around 180˚ before you knew what was happening.

YMMV

[varia]

interesting...
my front is porsche 993 TT caliper w 993tt/GT-3 322x32mm rotor w/ BIRA rotor hat RS2 front caliper bracket
rear is urS4/6 rear caliper B5 S4 rear caliper bracket B5 S4 rear disk

I got this Custom two piece 345mm rotors, anodized aluminum hat, custom steel mounting brackets zinc coated with brand new 18z calipers from Porsche for the cq im building.
for the rear i was planning to use my setup
and i was hoping, it will just bolt on and work. soon we shall see

image.jpg (809.12 KiB) Viewed 46683 times

[themagellan]

Nice setup ^

I've been reading and researching a lot on these too.

Turns out the Apikol 17z (b5) brackets will fit g60 uprights but like someone mentioned you would need custom rotors with the right offset. They mentioned they are ~800 for a pair for those interested (they are two piece yummies)

Im also assuming/curious if the b5 1.8 brakes are a direct fit for the g60 uprights using a stock b5 caliper. I know they are nothing to write home about, but at least they are not g60s (greased skids for brakes)

I noticed a while back there was a urs group buy for a bracket (17z) that allowed for the 330 rotors to be run without any issues. But not sure if that's fact or fiction.

The 6piston options sounds so tantalizing.

[PRY4SNO]

Nice set up Chris.

I wish I knew about the UrS rears when I did it a few years back, I bet they are right in the sweet spot where it doesn't skew the bias with the larger rotor. I may retrofit these for this purpose later to experiment, instead of adding a bias valve (last resort).

[Wheeljack]

I noticed a while back there was a urs group buy for a bracket (17z) that allowed for the 330 rotors to be run without any issues. But not sure if that's fact or fiction.

Not to derail the post from the OP's intent, but I'll at least address the fact vs. fiction question on the URS group buy BBK setup...

I put together the kit for the URS/17Z/323X30A8 setup because it was a really nice cost-effective setup where you could get a full BBK setup for <$800 all in. I've also done kits for 345/350mm rotors, but the group buy kit was intended to be low cost and able to work with 17" wheels. The use of the A8 323X30 rotor with its large offset also keeps the caliper inboard as much as possible to minimize the need for wheel spacers. And if you use the Brembo rotor (still only about $80/each) it is a nice inside vented design as opposed to the OEM A8 rotors. Brackets are FEA optimized and CNC machined in 1018 steel offered in raw or zinc plated. The custom brackets allow for a perfect fit and I've sold over 40 sets without a single complaint regarding fitment.

I've also run this setup personally for about 6K+ miles and thought I would want a brake proportioning valve, but this setup has been pretty balanced and I've done a lot of limited traction driving in the snow that would typically uncover issues with brake balance. Performance increase over stock G60's is significant. Ultimately, I think the brake prop. valve would be beneficial as there is certainly more brake force up from versus stock, but so far no ill effects without having one.

Here are the brackets:


Here is the 17Z on a URS4 with 17" rims during original test fitting:


and showing the radial clearance on 18" rims:


Thanks to the huge numbers of Cayenne sales over the years, these calipers can generally be bought for $300/pair freshly refurbished from online discount parts suppliers.

[Aktapod]

This may be a dumb question, but could those brackets be used to mount HP2's?

[themagellan]

Probably with some offset or grinding the caliper. Looks like MK5 brakes also bolt up with 17z.

I think at the price point the 17z is the best choice available.

[Aktapod]

I only ask because I have a box of HP2's leftover from upgrading to 17z's on my dad's S4. I was hoping there was some way to bolt them up without using the rusty UFO housings I have sitting around. Maybe I should consider 17Z's instead

How is the brake feel of 17Z's coming from G60's? They take a little more travel to really engage after switching from HP2's on the S4.

[themagellan]

I only ask because I have a box of HP2's leftover from upgrading to 17z's on my dad's S4. I was hoping there was some way to bolt them up without using the rusty UFO housings I have sitting around. Maybe I should consider 17Z's instead

How is the brake feel of 17Z's coming from G60's? They take a little more travel to really engage after switching from HP2's on the S4.

Makes sense, bolt on pieces


Probably worlds better, I don't think g60s have good feel. Hope your dad bled the brakes a TON at all corners. 6 piston in theory should have the best 'feel'

[Wheeljack]

How is the brake feel of 17Z's coming from G60's? They take a little more travel to really engage after switching from HP2's on the S4.

Huge difference...I drive two uRS's back to back many times, one with the 17Z and cheap pads and the other with G60's. It is night and day. And pedal travel is not compromised because the actual piston area is very close between the two. I have the calculations in my notes somewhere. I can post them later.

[thefigbaron]

I'm wondering if Boxster S calipers with 245 S8 rotors will clear a 17" wheel. I thought I saw a D2 s8 with 17" on it but can't find that thread anywhere.

This is crappyoldaudis from MG, btw. I only picked that UN when i was working on my brother's 20v 200 years ago. time to upgrade.